Even as the tech world works to figure out just what to do with the potential of cloud computing and big data, along comes a new bit of technology fueled by open source software: software-defined networks.

“Stronger definition of network behavior in software is a growing trend, and open interfaces are going to lead to faster innovation,” said Nick McKeown, ONF Board member and professor at Stanford University.

"I want to share with you the process of installing PacketFence on Ubuntu and then how it can be used from the command line to create a powerful network access control system," Jack Wallen says in his Install and Configure Packetfence on Ubuntu Linux article.